EP0135739A1 - Tête magnétique combinée d'écriture et de lecture pour support d'enregistrement à magnétisation verticale - Google Patents

Tête magnétique combinée d'écriture et de lecture pour support d'enregistrement à magnétisation verticale Download PDF

Info

Publication number
EP0135739A1
EP0135739A1 EP84109248A EP84109248A EP0135739A1 EP 0135739 A1 EP0135739 A1 EP 0135739A1 EP 84109248 A EP84109248 A EP 84109248A EP 84109248 A EP84109248 A EP 84109248A EP 0135739 A1 EP0135739 A1 EP 0135739A1
Authority
EP
European Patent Office
Prior art keywords
pole
recording medium
magnetic
magnetic head
pole legs
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP84109248A
Other languages
German (de)
English (en)
Other versions
EP0135739B1 (fr
Inventor
Herbert Dr. Schewe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to AT84109248T priority Critical patent/ATE39302T1/de
Publication of EP0135739A1 publication Critical patent/EP0135739A1/fr
Application granted granted Critical
Publication of EP0135739B1 publication Critical patent/EP0135739B1/fr
Expired legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/1278—Structure or manufacture of heads, e.g. inductive specially adapted for magnetisations perpendicular to the surface of the record carrier

Definitions

  • the invention relates to a combined write and read magnetic head for a recording medium, which is provided with at least one magnetizable storage layer which contains a magnetically anisotropic material whose axis of easy magnetization is oriented substantially perpendicular to the surface of the medium, and into which along a track, information is to be written in by vertical magnetization of the storage layer, which magnetic head has a guide body guiding the magnetic flux with two pole legs, which are arranged one behind the other in the direction of movement of the head and at a predetermined distance from one another and to which at least one coil winding is assigned, for the reading function the flow guide directions in the two pole legs at least largely run antiparallel at their ends facing the recording medium.
  • a magnetic head emerges from DE-OS 29 24 013.
  • the principle of vertical magnetization for the storage of information is generally known (cf. for example "IEEE Transactionson Magnetics", vol. MAG-16, no. 1, Jan. 1980, pages 71 to 76 or the aforementioned DE-OS).
  • This principle which is often referred to as vertical magnetization, requires special recording media such as a rigid magnetic disk, a flexible single disk (floppy disc) or a magnetic tape.
  • Such a recording medium has at least one magnetizable storage layer with predetermined "to the thickness, which contains a magnetically anisotropic material, in particular made of a CoCr alloy, the axis of which is slightly magnetized and is directed perpendicular to the surface of the medium.
  • the individual information is then along a track in successive sections, including cells
  • the magnetic flux changes ie the transitions from one magnetization direction to the opposite, are generally used as information.
  • the sections have a predetermined extent in the longitudinal direction of the track, also referred to as wavelength. This expansion can be significantly smaller than the limit given in the longitudinal storage method by demagnetization, so that the information density in the recording medium advantageously increases according to the principle of perpendicular magnetization eats.
  • a suitable combined read / write head that is to say a magnetic head, with which both the write and the read function are to be carried out, generally has a so-called main pole, with which a sufficiently strong vertical magnetic field is generated to remagnetize the individual sections in the storage layer becomes.
  • the necessary conclusion can then be made, for example, by means of a so-called auxiliary pole on the opposite side of the recording medium (cf. the mentioned literature reference "IEEE Trans. Magn.”, Vol. MAG-16).
  • auxiliary pole on the opposite side of the recording medium
  • the read and write magnetic head known from DE-OS 29 24 013 contains, in the direction of movement of the recording medium moved beneath it, an auxiliary pole on its front end and the actual main pole on its rear side.
  • This main pole is formed by a pole leg, which essentially consists of a thin pole piece running perpendicular to the direction of movement, which is applied to a non-magnetic substrate.
  • the auxiliary pole which is more extensive in the direction of movement and which lies in front of the main pole, is formed by a pole leg which is composed of a plurality of thin pole pieces arranged perpendicular to the direction of movement with insulating layers in between and which is separated from the main pole by an air gap.
  • the expansion of this air gap is relatively large and is, for example, in the order of 5 to 10 / um.
  • the auxiliary pole serves in any case only for the return of the river.
  • a possible recording of the auxiliary pole can be accepted, since the main pole always lags behind and thus overwrites any information written by the auxiliary pole, provided that the width of the auxiliary pole is not greater than that of the main pole and thus be neighboring tracks already described remain unaffected.
  • the larger cross section of the auxiliary pole compared to the main pole and the relatively large expansion of the air gap are required to ensure a substantial reduction in the magnetic flux density at the auxiliary pole.
  • reading the auxiliary pole can lead to difficulties in information recognition.
  • This gap ß chicht should consist of a hard material such as Al203 as possible in order to avoid nicks or erosion during the head manufacturing. Such bumps can lead to the crash of the magnetic head, which is guided over the recording medium at an extremely short distance, by dirt particles that are embedded. However, it has been shown that the production of this gap layer lying between the main and the auxiliary pole is extremely difficult to carry out.
  • the function of writing and reading can also be carried out with separate heads in order to be able to optimally adapt these heads to the respective function (see, for example, "IEEE Trans "Magn.”, Vol. MAG-16, no. 5, Sept. 1980, pages 967 to 972).
  • Well-known ring heads can be used for reading, while writing is to be carried out with special heads.
  • Such a recording head has, for example on its the memory layer of the recording medium facing side of a main pole, also called single-pole head with the longitudinal extent of, for example 3 / um on the on the back of the recording mediums is a much more extensive auxiliary pole.
  • the second, only required to read head is a known ring head and has a gap width of, for example, 0.2 / um (see. "IEEE Trans. Magn.”, Vol. MAG-17, no. 6, November 1981, pages 2538 to 2540).
  • Corresponding devices for reading and writing with special heads adapted to the respective function are structurally relatively complex.
  • each pole leg is assigned its own coil winding and that for the write function by means of these coil windings the flow guidance directions in the pole legs are adjustable so that these directions at least largely parallel at the ends facing the recording medium.
  • the advantages associated with this configuration of the magnetic head are to be seen in particular in the fact that, due to the uniform magnetization directions in the two pole legs, the magnetic fields emerging at their ends reinforce one another with regard to their vertical components, so that the magnetic head acts as a single pole head Writes information to the recording medium.
  • the distance between the pole leg ends can therefore also be kept very small, which is why the head also has good reading properties and the risk of washing out the formed between these ends Gap is at least largely excluded.
  • each pole leg is assigned its own coil winding and that the magnetic fluxes in the pole legs can be adjusted for the write function by means of these coil windings such that the magnetic flux in one of the pole legs at their ends facing the recording medium is smaller and opposite to the magnetic flux in the other pole leg.
  • a magnetic field with a very pronounced vertical component which is used to write the information into the recording medium, can advantageously be concentrated on one leg.
  • FIGS. 1 and 2 show a magnetic head according to the invention for two different types of writing.
  • Fig. 3 shows this magnetic head during reading.
  • 4 shows a further embodiment of a magnetic head according to the invention during reading.
  • a known head is assumed, as can be seen, for example, from DE-OS 29 24 013 mentioned at the beginning.
  • the head generally designated 2 in the figure, which is shown during its writing function according to the principle of vertical (vertical) magnetization, is located, for example, on the end face or on the rear side of a common element called a missile, the is not detailed in the figure.
  • It is relative to a known recording medium M in f low altitude, for example, 0, 2 / to perform on this medium.
  • the recording medium is passed under the magnetic head.
  • the relative direction of movement of the magnetic head 2 with respect to the recording medium M is indicated by an arrowed line denoted by v.
  • the recording medium M for example a magnetic storage disk, has a storage layer 3, in particular made of a CoCr alloy, which has a predetermined thickness d.
  • This layer can optionally be connected on its side facing away from the magnetic head 2 with a soft magnetic layer 4, for example made of a special NiFe alloy.
  • the storage layer 3 and optionally the layer 4 are deposited on the upper flat side of a carrier body 5 of the recording medium M.
  • the magnetic head 2 has two pole legs 7 and 8, which are largely and in particular at their ends 9 and 10 facing the recording medium M oriented at least approximately perpendicular to the surface of the recording medium M.
  • An air gap 11 is formed between these pole leg ends with an advantageously small longitudinal, that is to say in the direction of movement, width w of less than 1 ⁇ m, in particular less than 0.3 ⁇ m.
  • width w width of less than 1 ⁇ m, in particular less than 0.3 ⁇ m.
  • the distance between the two pole legs 7 and 8 is widened with respect to the gap width w ', for example in that the pole leg 7, which is rearward with respect to the direction of movement, leads in this region to a greater distance w with respect to the front pole leg 8, which is just formed.
  • each pole leg is surrounded according to the invention by its own coil winding 14 or 15 in this region 12. Outside this area on the recording side facing away from medium M, the pole legs are brought together again in a known manner.
  • a substrate 16 is generally used, which consists, for example, of TiC and Al 2 O 3 . If necessary, the substrate 16 can be provided with a sufficiently thick insulation layer, for example made of A1 2 0 3 .
  • thin magnetic layers made of special NiFe alloys such as permalloy (Ni / Fe-81/19) or FeB are first applied by sputtering, vapor deposition or galvanic deposition and by a non-magnetic intermediate layer made of Si0 2 or, for example Al 2 O 3 separated from one another. The magnetization of these magnetic layers lies in the layer plane.
  • the magnetic layers Due to the manufacturing process, the magnetic layers have a uniaxial anistropy, that is to say that each magnetic layer has two anistropy axes rotated by 90 °, which are referred to as light or heavy directions.
  • the magnetization is preferably parallel or antiparallel to the easy direction.
  • the slight direction of the magnetic layers can be induced, for example, when the respective layer is applied by an applied magnetic field.
  • the grown, different layers are structured by techniques known per se, such as photolithography, plasma, ion beam or wet chemical etching, and thus the two pole legs 7 and 8 of the magnetic head 2 are produced.
  • the easy direction of the magnetization of the magnetic layers is generally always perpendicular to the direction of the magnetic flux in the pole legs, ie in the region of the ends 9 and 10 essentially parallel to the surface of the recording medium M.
  • an insulation layer for example Si0 2 applied and are then the on and / or off read the data in the magnetic storage layer 3 of the recording medium M required coil windings 14 and 15 manufactured or structured. These windings consist of Cu, Au or Al, for example.
  • the coil windings 14 and 15 can optionally be leveled in a known manner using polyimide lacquer. This is followed by the application and structuring of the second pole leg 7. Finally, to protect the thin-film magnetic head 2, a relatively thick protection layer, for example made of A1 2 0 3, is applied.
  • a write function is currently to be performed.
  • the two coil windings 14 and 15 are so excited due to the current-carrying directions shown on them in the figure that the magnetic fluxes in the pole legs 7 and 8 assigned to them run essentially parallel.
  • the field line course resulting on the side of the pole limbs facing away from the recording medium M is indicated by arrowed lines 17.
  • a magnetic field with a pronounced vertical (vertical) component emerges due to the magnetic fluxes or magnetizations illustrated by the arrowed lines 18 and 19, with which the storage layer 3 is magnetized by appropriate magnetization corresponding information is written on the recording medium M.
  • the polarity at the ends 9 and 10 can advantageously be approximately the same, ie there is approximately the same magnetic flux there.
  • the magnetic flux densities at the pole leg ends should also be at least largely the same size, so that the pole leg ends then have approximately the same cross-sectional areas.
  • the magnetization in the section 20 of the memory thus described Layer 3 is illustrated with an arrowed line 21.
  • the longitudinal extent 1 of this storage section 20 is shown in the order of magnitude of the corresponding distance between the outer edges of the pole leg ends 9 and 10. In general, however, this extent 1 is smaller, so that with the magnetic head 2 according to the invention a higher information density in the recording medium M is practically achieved than would correspond to the geometric extent of the two pole legs (cf. for example also "IEEE Trans. Magn.”, Vol. MAG-17, no. 6, Nov. 81, pages 2538 to 2540).
  • both pole legs 7 and 8 of the magnetic head have the same directions of flux or magnetization 18 and 19 at their ends 9 and 10. This is achieved by a corresponding excitation of the two coil windings 14 and 15.
  • FIG. 2 parts corresponding to FIG. 1 being provided with the same reference symbols.
  • the currents in the coil windings 14 and 15 are therefore to be selected such that the vertical magnetic field component H 1 emerging at the end 9 of the pole leg 7 is greater in magnitude than the coercive field strength H 0 of the storage layer 3 and the vertical magnetic field component H 2 at the end 10 of the Pole leg 8 are significantly smaller in magnitude than the coercive field strength H.
  • the part of the magnetic flux generated by the coil winding 14, which would be lost as a result of undesirable stray fields can be kept relatively small, and the vertical magnetic field component generated by the magnetic head 2 can thus be increased accordingly.
  • FIG. 3 shows the magnetic head 2 according to FIG. 1 or 2 in a corresponding representation when reading, parts corresponding to these figures being provided with the same reference numerals.
  • the coil windings 14 and 15 are advantageously connected in series, so that the voltages induced in them add up.
  • the detection can also be carried out with only one of the coil windings.
  • FIG. 4 Another embodiment of a magnetic head according to the invention is shown in FIG. 4 in a corresponding representation during its reading function.
  • This magnetic head, designated 25, differs from the magnetic head 2 according to FIGS. 1 to 3 essentially only in that its two pole legs 26 and 27 are closed ordered coil windings each have two partial windings 28, 29 and 30, 31.
  • the partial windings 28 and 30 are accommodated in an intermediate space 33 formed between the two pole legs 26 and 27.
  • the two partial windings 29 and 3i are only separated from one another by these pole legs.
  • This embodiment has the particular advantage that a larger number of coil windings to be arranged one above the other is avoided, that is to say that the longitudinal extension of the magnetic head must be limited accordingly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Magnetic Heads (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)
EP84109248A 1983-08-19 1984-08-03 Tête magnétique combinée d'écriture et de lecture pour support d'enregistrement à magnétisation verticale Expired EP0135739B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84109248T ATE39302T1 (de) 1983-08-19 1984-08-03 Kombinierter schreib- und lese-magnetkopf fuer ein senkrecht zu magnetisierendes aufzeichnungsmedium.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833330023 DE3330023A1 (de) 1983-08-19 1983-08-19 Kombinierter schreib- und lese-magnetkopf fuer ein senkrecht zu magnetisierendes aufzeichnungsmedium
DE3330023 1983-08-19

Publications (2)

Publication Number Publication Date
EP0135739A1 true EP0135739A1 (fr) 1985-04-03
EP0135739B1 EP0135739B1 (fr) 1988-12-14

Family

ID=6206990

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84109248A Expired EP0135739B1 (fr) 1983-08-19 1984-08-03 Tête magnétique combinée d'écriture et de lecture pour support d'enregistrement à magnétisation verticale

Country Status (5)

Country Link
US (1) US4675766A (fr)
EP (1) EP0135739B1 (fr)
JP (1) JPS6059511A (fr)
AT (1) ATE39302T1 (fr)
DE (2) DE3330023A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0232505A1 (fr) * 1985-12-20 1987-08-19 Siemens Aktiengesellschaft Dispositif de stockage magnétique à milieu d'enregistrement à magnétiser perpendiculairement

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0218811B1 (fr) * 1985-07-19 1991-05-29 Kabushiki Kaisha Toshiba Assemblage de glisseur pour têtes magnétiques
US5081554A (en) * 1987-04-01 1992-01-14 Digital Equipment Corporation Biasing conductor for MR head
US5159511A (en) * 1987-04-01 1992-10-27 Digital Equipment Corporation Biasing conductor for MR head
US5075956A (en) * 1988-03-16 1991-12-31 Digital Equipment Corporation Method of making recording heads with side shields
TW294810B (fr) * 1994-09-23 1997-01-01 Philips Electronics Nv
JPH10255239A (ja) * 1997-03-06 1998-09-25 Read Rite S M I Kk インダクティブ／ｍｒ複合型薄膜磁気ヘッド
US6513228B1 (en) * 2000-01-05 2003-02-04 Seagate Technology Llc Method for forming a perpendicular recording read/write head
DE102006045718A1 (de) * 2006-09-27 2008-04-10 Siemens Ag Medizinisches System mit einer Erfassungsvorrichtung zum Erfassen eines Objekts mittels Röntgenstrahlen und mit einer Speichervorrichtung und Verfahren
US9159340B1 (en) * 2014-08-28 2015-10-13 Seagate Technology Llc Coil structure for write head
US9082428B1 (en) 2014-08-28 2015-07-14 Seagate Technology Llc Write head with coil structure aligned with yoke
US9230570B1 (en) 2014-08-28 2016-01-05 Seagate Technology Llc Write head having two yokes
US9082427B1 (en) 2014-09-25 2015-07-14 Seagate Technology Llc Write head having reduced dimensions

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1189713A (en) * 1966-06-21 1970-04-29 Vm Corp Electro-Magnetic Transducer Head.
US3686468A (en) * 1969-09-15 1972-08-22 Robert C Garnier Jr Magnetic transducer having two core members of distinctly different magnetic field carrying characteristics
EP0053944A1 (fr) * 1980-12-09 1982-06-16 Matsushita Electric Industrial Co., Ltd. Assemblage de tête d'enregistrement et de reproduction magnétique perpendiculaire et système d'enregistrement magnétique l'utilisant

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5434205A (en) * 1977-08-22 1979-03-13 Canon Inc Magnetic recording medium
FR2428886A1 (fr) * 1978-06-13 1980-01-11 Cii Honeywell Bull Support d'information magnetique a enregistrement perpendiculaire
JPS57135418A (en) * 1981-02-17 1982-08-21 Fujitsu Ltd Composite thin film head
JPS58111113A (ja) * 1981-12-25 1983-07-02 Seiko Epson Corp 磁気ヘッド

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1189713A (en) * 1966-06-21 1970-04-29 Vm Corp Electro-Magnetic Transducer Head.
US3686468A (en) * 1969-09-15 1972-08-22 Robert C Garnier Jr Magnetic transducer having two core members of distinctly different magnetic field carrying characteristics
EP0053944A1 (fr) * 1980-12-09 1982-06-16 Matsushita Electric Industrial Co., Ltd. Assemblage de tête d'enregistrement et de reproduction magnétique perpendiculaire et système d'enregistrement magnétique l'utilisant

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 6, Nr. 237, 25. November 1982, Seite (P-157) (1115); & JP-A-57-135418 (FUJITSU), 21-08-1982 *
PATENT ABSTRACTS OF JAPAN, Band 7, Nr. 30, 5. Februar 1983, Seite (P-173) (1175) & JP-A-57-183614 (NIPPON DENSHIN DENWA KOSHA), 12-11-1982 *
PATENT ABSTRACTS OF JAPAN, Band 8, Nr. 79, 11. April 1984, Seite (P. 267) (1516) & JP-A-58-222413 (SUWA SEIKOSHA) 24-12-1983 * Zusammenfassung * *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0232505A1 (fr) * 1985-12-20 1987-08-19 Siemens Aktiengesellschaft Dispositif de stockage magnétique à milieu d'enregistrement à magnétiser perpendiculairement
US4742413A (en) * 1985-12-20 1988-05-03 Siemens Akteingesellschaft Magnetic memory including a recording device and medium that can be magnetized vertically

Also Published As

Publication number Publication date
JPS6059511A (ja) 1985-04-05
DE3330023A1 (de) 1985-02-28
EP0135739B1 (fr) 1988-12-14
ATE39302T1 (de) 1988-12-15
US4675766A (en) 1987-06-23
DE3475666D1 (en) 1989-01-19

Similar Documents

Publication Publication Date Title
EP0150368B1 (fr) Tête magnétique combinée d'écriture et de lecture pour magnétiser verticalement un milieu d'enregistrement correspondant
EP0166890B1 (fr) Tête magnétique en couches minces, à entrefer double, pour un milieu d'enregistrement magnétisé perpendiculairement
EP0146861B1 (fr) Dispositif avec une tête magnétique à couches minces pour l'enregistrement perpendiculaire (vertical)
EP0150371B1 (fr) Tête magnétique en couche mince pour milieu d'enregistrement à magnétiser verticalement
EP0135738B1 (fr) Tête magnétique de lecture et d'écriture pour support d'enregistrement à magnétisation verticale
EP0311854A1 (fr) Tête magnétique à film mince à structure en couches pour magnétisation perpendiculaire
DE3213928A1 (de) Senkrecht - magnetkopf
EP0135739B1 (fr) Tête magnétique combinée d'écriture et de lecture pour support d'enregistrement à magnétisation verticale
EP0166818B1 (fr) Tête magnétique construite en couches pour un milieu d'enregistrement à magnétiser perpendiculairement
EP0186032B1 (fr) Tête magnétique à film mince pour un milieu d'enregistrement à magnétiser perpendiculairement
EP0223984B1 (fr) Tête magnétique à films minces à pôles principal et auxiliaire pour magnétisation perpendiculaire
DE3940098A1 (de) Duennfilm-magnetkopf mit in einem substrat versenkten teilen sowie verfahren zu dessen herstellung
EP0146003B1 (fr) Tête magnétique à pôle principal et auxiliaire pour un moyen d'enregistrement magnétisé perpendiculairement
EP0135096B1 (fr) Tête magnétique pour un moyen d'enregistrement à magnétiser perpendiculairement
EP0166031A1 (fr) Tête magnétique en couches minces d'enregistrement et de lecture pour un moyen d'enregistrement magnétisé perpendiculairement
DE69815490T2 (de) Einkanal-magnetkopf mit magnetoresistivem element
EP0326904A1 (fr) Tête magnétique en film mince à capteur magnétorésistif intégré
DE3346886C2 (fr)
DE3418822C2 (fr)
EP0423138B1 (fr) Tete magnetique a couche mince avec des branches d'aimant comportant une pluralite de couches magnetiques distinctes
DE4026316A1 (de) Duennfilm-magnetkopf mit einem doppelspalt zur senkrechten magnetisierung eines entsprechenden aufzeichnungsmediums
EP0139914A1 (fr) Procédé d'enregistrement d'informations magnétique en mode perpendiculaire et tête magnétique pour réaliser le procédé
EP0311855A2 (fr) Tête magnétique à film mince à structure en couches
DE3501810A1 (de) Duennschicht-magnetkopf mit einem doppelspalt fuer ein senkrecht zu magnetisierendes aufzeichnungsmedium
WO1990009658A1 (fr) Tete magnetique a couche mince d'enregistrement vertical avec deux poles magnetiques separes par une fente etroite

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19841221

AK Designated contracting states

Designated state(s): AT CH DE FR GB IT LI NL SE

RTI1 Title (correction)
17Q First examination report despatched

Effective date: 19861128

D17Q First examination report despatched (deleted)
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT CH DE FR GB IT LI NL SE

REF Corresponds to:

Ref document number: 39302

Country of ref document: AT

Date of ref document: 19881215

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3475666

Country of ref document: DE

Date of ref document: 19890119

ET Fr: translation filed
ITF It: translation for a ep patent filed

Owner name: STUDIO JAUMANN

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19890803

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19890818

Year of fee payment: 6

ITTA It: last paid annual fee
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19891123

Year of fee payment: 6

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19900719

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19900803

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19900804

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19900827

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19900831

Ref country code: CH

Effective date: 19900831

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19900831

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19901025

Year of fee payment: 7

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19910803

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19920301

GBPC Gb: european patent ceased through non-payment of renewal fee
NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19920430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19920501

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

EUG Se: european patent has lapsed

Ref document number: 84109248.9

Effective date: 19910410